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NR 322: Scale and Resolution. Jim Graham & Alex Daniels Fall 2010 Chapter 2. Scale. Scale is the scale of the map relative to the true size of the items on the map e.g 1:750,000 1 unit on the map is equivalent to 750,000 units on the earth Small scale vs Large scale Which number is larger

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nr 322 scale and resolution

NR 322: Scale and Resolution

Jim Graham & Alex Daniels

Fall 2010

Chapter 2

scale
Scale
  • Scale is the scale of the map relative to the true size of the items on the map
  • e.g 1:750,000
    • 1 unit on the map is equivalent to 750,000 units on the earth
  • Small scale vs Large scale
  • Which number is larger
    • 1 / 750,000 or 1 / 2
misunderstood terminology
Misunderstood Terminology
  • Small Scale = Large Extent
    • Think of the divisions on the scale being small
    • Miles are smaller at small scale
  • Large Scale = Small Extent
    • Think of the divisions on the scale being big
    • Miles are larger at large scale
  • Recommendation:
    • Use Large Extent or Small Extent
    • Use Low Resolution or High Resolution
scale can vary on a map
Scale can vary on a map
  • What is the scale in kilometers on a Geographic Projection map?
scale can vary
Scale can Vary
  • What is the scale on a google earth map?
resolution
Resolution
  • Resolution is the ability to resolve detail
  • We mostly refer to Spatial Resolution
    • For Rasters/Grids/Digital Photos this means the size of the pixels.
    • What distance on the ground does one pixel represent?

30 Meters

resolution1
Resolution
  • High resolution is awesome, why don\'t we make everything 1m data or better?
  • The number of pixels increases exponentially as you increase spatial res.

Resolution x 2

Pixels x 4

high resolution big files
High Resolution ~ Big Files
  • Rasters and photos can get really big really fast.
  • Civilian satellites now can take satellite photos as high as 41 cm resolution
  • i³ in Fort Collins has 1m Satellite Photos that take 300 Gigabytes for just one area.
low spatial resolution
Low spatial resolution
  • Low resolution averages data
accuracy and precision
Accuracy and Precision
  • Accuracy is how close something is to the true value
  • Precision is how close of a measurement you can make
  • High accuracy doesn\'t mean high precision
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